wifi: rtw89: coex: Add v1 Bluetooth AFH handshake for WiFi 7

WiFi 7 generation has dual MAC, Coexistence need to find out the
2GHz WiFi connection in the connected links. And assign its channel
to Bluetooth to make Bluetooth not to hop into WiFi channel.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250616090252.51098-2-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw89/coex.c b/drivers/net/wireless/realtek/rtw89/coex.c
index 934407dc53ea3f5180f10046f8469b59ae9507b0..d95ddc928e3d98391c93f579d3e78c7cd92b8929 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/coex.c
+++ b/drivers/net/wireless/realtek/rtw89/coex.c
@@ -3186,7 +3186,7 @@ static void _update_btc_state_map(struct rtw89_dev *rtwdev)
        }
 }
 
-static void _set_bt_afh_info(struct rtw89_dev *rtwdev)
+static void _set_bt_afh_info_v0(struct rtw89_dev *rtwdev)
 {
        const struct rtw89_chip_info *chip = rtwdev->chip;
        struct rtw89_btc *btc = &rtwdev->btc;
@@ -3355,6 +3355,115 @@ static void _set_bt_afh_info(struct rtw89_dev *rtwdev)
        btc->cx.cnt_wl[BTC_WCNT_CH_UPDATE]++;
 }
 
+static void _set_bt_afh_info_v1(struct rtw89_dev *rtwdev)
+{
+       const struct rtw89_chip_info *chip = rtwdev->chip;
+       struct rtw89_btc *btc = &rtwdev->btc;
+       struct rtw89_btc_wl_info *wl = &btc->cx.wl;
+       struct rtw89_btc_wl_role_info_v8 *wl_rinfo = &wl->role_info_v8;
+       struct rtw89_btc_wl_afh_info *wl_afh = &wl->afh_info;
+       struct rtw89_btc_bt_info *bt = &btc->cx.bt;
+       struct rtw89_btc_wl_rlink *rlink;
+       u8 en = 0, ch = 0, bw = 0, buf[3] = {};
+       u8 i, j, link_mode;
+
+       if (btc->manual_ctrl || wl->status.map.scan)
+               return;
+
+       link_mode = wl_rinfo->link_mode;
+
+       for (i = 0; i < btc->ver->max_role_num; i++) {
+               for (j = RTW89_MAC_0; j < RTW89_MAC_NUM; j++) {
+                       if (wl->status.map.rf_off || bt->whql_test ||
+                           link_mode == BTC_WLINK_NOLINK ||
+                           link_mode == BTC_WLINK_5G)
+                               break;
+
+                       rlink = &wl_rinfo->rlink[i][j];
+
+                       /* Don't care no-connected/non-2G-band role */
+                       if (!rlink->connected || !rlink->active ||
+                           rlink->rf_band != RTW89_BAND_2G)
+                               continue;
+
+                       en = 1;
+                       ch = rlink->ch;
+                       bw = rlink->bw;
+
+                       if (link_mode == BTC_WLINK_2G_MCC &&
+                           (rlink->role == RTW89_WIFI_ROLE_AP ||
+                            rlink->role == RTW89_WIFI_ROLE_P2P_GO ||
+                            rlink->role == RTW89_WIFI_ROLE_P2P_CLIENT)) {
+                               /* for 2.4G MCC, take role = ap/go/gc */
+                               break;
+                       } else if (link_mode != BTC_WLINK_2G_SCC ||
+                                  rlink->bw == RTW89_CHANNEL_WIDTH_40) {
+                               /* for 2.4G scc, take bw = 40M */
+                               break;
+                       }
+               }
+       }
+
+       /* default AFH channel sapn = center-ch +- 6MHz */
+       switch (bw) {
+       case RTW89_CHANNEL_WIDTH_20:
+               if (btc->dm.freerun || btc->dm.fddt_train)
+                       bw = 48;
+               else
+                       bw = 20 + chip->afh_guard_ch * 2;
+               break;
+       case RTW89_CHANNEL_WIDTH_40:
+               if (btc->dm.freerun)
+                       bw = 40 + chip->afh_guard_ch * 2;
+               else
+                       bw = 40;
+               break;
+       case RTW89_CHANNEL_WIDTH_5:
+               bw = 5 + chip->afh_guard_ch * 2;
+               break;
+       case RTW89_CHANNEL_WIDTH_10:
+               bw = 10 + chip->afh_guard_ch * 2;
+               break;
+       default:
+               en = false; /* turn off AFH info if invalid BW */
+               bw = 0;
+               ch = 0;
+               break;
+       }
+
+       if (!en || ch > 14 || ch == 0) {
+               en = false;
+               bw = 0;
+               ch = 0;
+       }
+
+       if (wl_afh->en == en &&
+           wl_afh->ch == ch &&
+           wl_afh->bw == bw &&
+           (!bt->enable.now || bt->enable.last))
+               return;
+
+       wl_afh->en = buf[0];
+       wl_afh->ch = buf[1];
+       wl_afh->bw = buf[2];
+
+       if (_send_fw_cmd(rtwdev, BTFC_SET, SET_BT_WL_CH_INFO, &wl->afh_info, 3)) {
+               rtw89_debug(rtwdev, RTW89_DBG_BTC,
+                           "[BTC], %s(): en=%d, ch=%d, bw=%d\n",
+                           __func__, en, ch, bw);
+
+               btc->cx.cnt_wl[BTC_WCNT_CH_UPDATE]++;
+       }
+}
+
+static void _set_bt_afh_info(struct rtw89_dev *rtwdev)
+{
+       if (rtwdev->chip->chip_id == RTL8922A)
+               _set_bt_afh_info_v1(rtwdev);
+       else
+               _set_bt_afh_info_v0(rtwdev);
+}
+
 static bool _check_freerun(struct rtw89_dev *rtwdev)
 {
        struct rtw89_btc *btc = &rtwdev->btc;